diff --git a/rust/candid/fuzz/Cargo.lock b/rust/candid/fuzz/Cargo.lock
index a908c669..0ffc0331 100644
--- a/rust/candid/fuzz/Cargo.lock
+++ b/rust/candid/fuzz/Cargo.lock
@@ -2,15 +2,6 @@
 # It is not intended for manual editing.
 version = 3
 
-[[package]]
-name = "aho-corasick"
-version = "0.7.20"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cc936419f96fa211c1b9166887b38e5e40b19958e5b895be7c1f93adec7071ac"
-dependencies = [
- "memchr",
-]
-
 [[package]]
 name = "anyhow"
 version = "1.0.68"
@@ -19,9 +10,9 @@ checksum = "2cb2f989d18dd141ab8ae82f64d1a8cdd37e0840f73a406896cf5e99502fab61"
 
 [[package]]
 name = "arbitrary"
-version = "1.2.3"
+version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3e90af4de65aa7b293ef2d09daff88501eb254f58edde2e1ac02c82d873eadad"
+checksum = "7d5a26814d8dcb93b0e5a0ff3c6d80a8843bafb21b39e8e18a6f05471870e110"
 
 [[package]]
 name = "arrayvec"
@@ -29,38 +20,12 @@ version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "23b62fc65de8e4e7f52534fb52b0f3ed04746ae267519eef2a83941e8085068b"
 
-[[package]]
-name = "ascii-canvas"
-version = "3.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8824ecca2e851cec16968d54a01dd372ef8f95b244fb84b84e70128be347c3c6"
-dependencies = [
- "term",
-]
-
-[[package]]
-name = "atty"
-version = "0.2.14"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
-dependencies = [
- "hermit-abi",
- "libc",
- "winapi",
-]
-
 [[package]]
 name = "autocfg"
 version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
 
-[[package]]
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-version = "0.5.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3a8241f3ebb85c056b509d4327ad0358fbbba6ffb340bf388f26350aeda225b1"
-
 [[package]]
 name = "binread"
 version = "2.2.0"
@@ -81,30 +46,9 @@ dependencies = [
  "either",
  "proc-macro2",
  "quote",
- "syn",
-]
-
-[[package]]
-name = "bit-set"
-version = "0.5.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0700ddab506f33b20a03b13996eccd309a48e5ff77d0d95926aa0210fb4e95f1"
-dependencies = [
- "bit-vec",
+ "syn 1.0.107",
 ]
 
-[[package]]
-name = "bit-vec"
-version = "0.6.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "349f9b6a179ed607305526ca489b34ad0a41aed5f7980fa90eb03160b69598fb"
-
-[[package]]
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-version = "1.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
-
 [[package]]
 name = "block-buffer"
 version = "0.10.3"
@@ -116,34 +60,28 @@ dependencies = [
 
 [[package]]
 name = "byteorder"
-version = "1.4.3"
+version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
+checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
 
 [[package]]
 name = "candid"
-version = "0.9.0-beta.2"
+version = "0.9.100"
 dependencies = [
  "anyhow",
  "binread",
  "byteorder",
  "candid_derive",
- "codespan-reporting",
- "crc32fast",
- "data-encoding",
  "hex",
- "lalrpop",
- "lalrpop-util",
+ "ic_principal",
  "leb128",
- "logos",
  "num-bigint",
  "num-traits",
- "num_enum",
  "paste",
  "pretty",
  "serde",
  "serde_bytes",
- "sha2",
+ "stacker",
  "thiserror",
 ]
 
@@ -159,12 +97,12 @@ dependencies = [
 
 [[package]]
 name = "candid_derive"
-version = "0.6.0"
+version = "0.6.5"
 dependencies = [
  "lazy_static",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.38",
 ]
 
 [[package]]
@@ -182,16 +120,6 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
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-version = "0.11.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3538270d33cc669650c4b093848450d380def10c331d38c768e34cac80576e6e"
-dependencies = [
- "termcolor",
- "unicode-width",
-]
-
 [[package]]
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 version = "0.2.5"
@@ -210,12 +138,6 @@ dependencies = [
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 ]
 
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-version = "0.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7a81dae078cea95a014a339291cec439d2f232ebe854a9d672b796c6afafa9b7"
-
 [[package]]
 name = "crypto-common"
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@@ -232,12 +154,6 @@ version = "2.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "23d8666cb01533c39dde32bcbab8e227b4ed6679b2c925eba05feabea39508fb"
 
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-version = "0.1.13"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "56254986775e3233ffa9c4d7d3faaf6d36a2c09d30b20687e9f88bc8bafc16c8"
-
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 version = "0.10.6"
@@ -248,54 +164,12 @@ dependencies = [
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 ]
 
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-version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b98cf8ebf19c3d1b223e151f99a4f9f0690dca41414773390fc824184ac833e1"
-dependencies = [
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-
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-dependencies = [
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- "winapi",
-]
-
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-dependencies = [
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-
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-
 [[package]]
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@@ -306,32 +180,6 @@ dependencies = [
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-version = "0.2.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
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-dependencies = [
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-dependencies = [
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@@ -339,22 +187,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
 
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-version = "1.9.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1885e79c1fc4b10f0e172c475f458b7f7b93061064d98c3293e98c5ba0c8b399"
+name = "ic_principal"
+version = "0.1.0"
 dependencies = [
- "autocfg",
- "hashbrown",
-]
-
-[[package]]
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-version = "0.10.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b0fd2260e829bddf4cb6ea802289de2f86d6a7a690192fbe91b3f46e0f2c8473"
-dependencies = [
- "either",
+ "arbitrary",
+ "crc32fast",
+ "data-encoding",
+ "hex",
+ "serde",
+ "serde_bytes",
+ "sha2",
+ "thiserror",
 ]
 
 [[package]]
@@ -366,38 +209,6 @@ dependencies = [
  "libc",
 ]
 
-[[package]]
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-version = "0.19.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
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- "atty",
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- "diff",
- "ena",
- "itertools",
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- "petgraph",
- "pico-args",
- "regex",
- "regex-syntax",
- "string_cache",
- "term",
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- "unicode-xid",
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-dependencies = [
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-
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@@ -412,9 +223,9 @@ checksum = "884e2677b40cc8c339eaefcb701c32ef1fd2493d71118dc0ca4b6a736c93bd67"
 
 [[package]]
 name = "libc"
-version = "0.2.139"
+version = "0.2.149"
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-checksum = "201de327520df007757c1f0adce6e827fe8562fbc28bfd9c15571c66ca1f5f79"
+checksum = "a08173bc88b7955d1b3145aa561539096c421ac8debde8cbc3612ec635fee29b"
 
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@@ -427,69 +238,6 @@ dependencies = [
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 ]
 
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-dependencies = [
- "memchr",
-]
-
 [[package]]
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 version = "0.4.3"
@@ -521,180 +269,62 @@ dependencies = [
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 ]
 
-[[package]]
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- "proc-macro2",
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- "libc",
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- "windows-sys",
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+checksum = "b55c4d17d994b637e2f4daf6e5dc5d660d209d5642377d675d7a1c3ab69fa579"
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-dependencies = [
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- "toml_edit",
+ "unicode-width",
 ]
 
 [[package]]
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-version = "1.0.50"
+version = "1.0.69"
 source = "registry+https://github.com/rust-lang/crates.io-index"
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 [[package]]
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+checksum = "5787f7cda34e3033a72192c018bc5883100330f362ef279a8cbccfce8bb4e874"
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-dependencies = [
- "getrandom",
- "redox_syscall",
- "thiserror",
+ "cc",
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 [[package]]
-name = "regex"
-version = "1.7.1"
+name = "quote"
+version = "1.0.33"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "48aaa5748ba571fb95cd2c85c09f629215d3a6ece942baa100950af03a34f733"
+checksum = "5267fca4496028628a95160fc423a33e8b2e6af8a5302579e322e4b520293cae"
 dependencies = [
- "aho-corasick",
- "memchr",
- "regex-syntax",
+ "proc-macro2",
 ]
 
-[[package]]
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-version = "0.6.28"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "456c603be3e8d448b072f410900c09faf164fbce2d480456f50eea6e25f9c848"
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-name = "scopeguard"
-version = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
-
 [[package]]
 name = "serde"
 version = "1.0.152"
@@ -721,7 +351,7 @@ checksum = "af487d118eecd09402d70a5d72551860e788df87b464af30e5ea6a38c75c541e"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.107",
 ]
 
 [[package]]
@@ -736,28 +366,16 @@ dependencies = [
 ]
 
 [[package]]
-name = "siphasher"
-version = "0.3.10"
+name = "stacker"
+version = "0.1.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7bd3e3206899af3f8b12af284fafc038cc1dc2b41d1b89dd17297221c5d225de"
-
-[[package]]
-name = "smallvec"
-version = "1.10.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a507befe795404456341dfab10cef66ead4c041f62b8b11bbb92bffe5d0953e0"
-
-[[package]]
-name = "string_cache"
-version = "0.8.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "213494b7a2b503146286049378ce02b482200519accc31872ee8be91fa820a08"
+checksum = "c886bd4480155fd3ef527d45e9ac8dd7118a898a46530b7b94c3e21866259fce"
 dependencies = [
- "new_debug_unreachable",
- "once_cell",
- "parking_lot",
- "phf_shared",
- "precomputed-hash",
+ "cc",
+ "cfg-if",
+ "libc",
+ "psm",
+ "winapi",
 ]
 
 [[package]]
@@ -772,23 +390,14 @@ dependencies = [
 ]
 
 [[package]]
-name = "term"
-version = "0.7.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c59df8ac95d96ff9bede18eb7300b0fda5e5d8d90960e76f8e14ae765eedbf1f"
-dependencies = [
- "dirs-next",
- "rustversion",
- "winapi",
-]
-
-[[package]]
-name = "termcolor"
-version = "1.2.0"
+name = "syn"
+version = "2.0.38"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "be55cf8942feac5c765c2c993422806843c9a9a45d4d5c407ad6dd2ea95eb9b6"
+checksum = "e96b79aaa137db8f61e26363a0c9b47d8b4ec75da28b7d1d614c2303e232408b"
 dependencies = [
- "winapi-util",
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
 ]
 
 [[package]]
@@ -808,33 +417,7 @@ checksum = "1fb327af4685e4d03fa8cbcf1716380da910eeb2bb8be417e7f9fd3fb164f36f"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
-]
-
-[[package]]
-name = "tiny-keccak"
-version = "2.0.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2c9d3793400a45f954c52e73d068316d76b6f4e36977e3fcebb13a2721e80237"
-dependencies = [
- "crunchy",
-]
-
-[[package]]
-name = "toml_datetime"
-version = "0.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4553f467ac8e3d374bc9a177a26801e5d0f9b211aa1673fb137a403afd1c9cf5"
-
-[[package]]
-name = "toml_edit"
-version = "0.18.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "56c59d8dd7d0dcbc6428bf7aa2f0e823e26e43b3c9aca15bbc9475d23e5fa12b"
-dependencies = [
- "indexmap",
- "nom8",
- "toml_datetime",
+ "syn 1.0.107",
 ]
 
 [[package]]
@@ -861,24 +444,12 @@ version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c0edd1e5b14653f783770bce4a4dabb4a5108a5370a5f5d8cfe8710c361f6c8b"
 
-[[package]]
-name = "unicode-xid"
-version = "0.2.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f962df74c8c05a667b5ee8bcf162993134c104e96440b663c8daa176dc772d8c"
-
 [[package]]
 name = "version_check"
 version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
-[[package]]
-name = "wasi"
-version = "0.11.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
-
 [[package]]
 name = "winapi"
 version = "0.3.9"
@@ -895,74 +466,8 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
 
-[[package]]
-name = "winapi-util"
-version = "0.1.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
-dependencies = [
- "winapi",
-]
-
 [[package]]
 name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
-
-[[package]]
-name = "windows-sys"
-version = "0.42.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5a3e1820f08b8513f676f7ab6c1f99ff312fb97b553d30ff4dd86f9f15728aa7"
-dependencies = [
- "windows_aarch64_gnullvm",
- "windows_aarch64_msvc",
- "windows_i686_gnu",
- "windows_i686_msvc",
- "windows_x86_64_gnu",
- "windows_x86_64_gnullvm",
- "windows_x86_64_msvc",
-]
-
-[[package]]
-name = "windows_aarch64_gnullvm"
-version = "0.42.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8c9864e83243fdec7fc9c5444389dcbbfd258f745e7853198f365e3c4968a608"
-
-[[package]]
-name = "windows_aarch64_msvc"
-version = "0.42.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4c8b1b673ffc16c47a9ff48570a9d85e25d265735c503681332589af6253c6c7"
-
-[[package]]
-name = "windows_i686_gnu"
-version = "0.42.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "de3887528ad530ba7bdbb1faa8275ec7a1155a45ffa57c37993960277145d640"
-
-[[package]]
-name = "windows_i686_msvc"
-version = "0.42.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bf4d1122317eddd6ff351aa852118a2418ad4214e6613a50e0191f7004372605"
-
-[[package]]
-name = "windows_x86_64_gnu"
-version = "0.42.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c1040f221285e17ebccbc2591ffdc2d44ee1f9186324dd3e84e99ac68d699c45"
-
-[[package]]
-name = "windows_x86_64_gnullvm"
-version = "0.42.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "628bfdf232daa22b0d64fdb62b09fcc36bb01f05a3939e20ab73aaf9470d0463"
-
-[[package]]
-name = "windows_x86_64_msvc"
-version = "0.42.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "447660ad36a13288b1db4d4248e857b510e8c3a225c822ba4fb748c0aafecffd"
diff --git a/rust/candid/fuzz/Cargo.toml b/rust/candid/fuzz/Cargo.toml
index 2c011dab..47e0514e 100644
--- a/rust/candid/fuzz/Cargo.toml
+++ b/rust/candid/fuzz/Cargo.toml
@@ -15,7 +15,7 @@ serde = "1.0.115"
 
 [dependencies.candid]
 path = ".."
-features = ["parser"]
+features = ["all"]
 
 # Prevent this from interfering with workspaces
 [workspace]
diff --git a/rust/candid/fuzz/fuzz_targets/type_decoder.rs b/rust/candid/fuzz/fuzz_targets/type_decoder.rs
index b6e4a609..201c03e7 100644
--- a/rust/candid/fuzz/fuzz_targets/type_decoder.rs
+++ b/rust/candid/fuzz/fuzz_targets/type_decoder.rs
@@ -11,10 +11,10 @@ pub struct Token {
     pub sha256: Option<ByteBuf>,
 }
 
-define_function!(pub callback : (&u8) -> (Nat));
+define_function!(pub Callback : (&u8) -> (Nat));
 #[derive(CandidType, Deserialize)]
 pub struct CallbackStrategy {
-    pub callback: callback,
+    pub callback: Callback,
     pub token: Token,
 }